# How I Vibe-Coded a Fast Client-Side Keyword Density Analyzer for SEO Content

> Source: <https://dev.to/hoangvibecode/how-i-vibe-coded-a-fast-client-side-keyword-density-analyzer-for-seo-content-1gl9>
> Published: 2026-08-21 02:18:43+00:00

Hey DEV community! 👋

When optimizing content for SEO, analyzing keyword density is a daily routine. However, sending long drafts to third-party servers raises privacy concerns, and many existing tools are overly clunky.

To solve this, I vibe-coded a lightweight **Keyword Density Analyzer** that runs **100% locally in your browser**.

Handling edge cases in text parsing (like filtering stop words, punctuation, and Unicode characters) can get tedious. Prompting the AI to isolate regex sanitization into pure helper functions saved a ton of boilerplate time while keeping client-side performance lightning fast.

I'd love to hear your thoughts on the UI or any additional NLP features you'd like to see!

👉 **Live Demo:** [Keyword Density Analyzer](https://voviethoang.com/en/tool/keyword-density-analyzer)

What tools or scripts do you use to analyze text performance in your workflow?